Oxford Centre for High Energy Density Science (OxCHEDS)

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Effect of target heating on ion-induced reactions in high-intensity laser–plasma interactions

Applied Physics Letters AIP Publishing 83:14 (2003) 2763-2765

Authors:

P McKenna, KWD Ledingham, T McCanny, RP Singhal, I Spencer, EL Clark, FN Beg, K Krushelnick, MS Wei, J Galy, J Magill, RJ Clarke, KL Lancaster, PA Norreys, K Spohr, R Chapman
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Transient strain driven by a dense electron-hole plasma

Physical Review Letters 91 (2003) 165502 4pp

Authors:

JS Wark, A. Cavalieri, D. A. Reis, M.F. Decamp
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Laser-driven photo-transmutation of 129I - A long-lived nuclear waste product

Journal of Physics D: Applied Physics 36:18 (2003)

Authors:

KWD Ledingham, J Magill, P McKenna, J Yang, J Galy, R Schenkel, J Rebizant, T McCanny, S Shimizu, L Robson, RP Singhal, MS Wei, SPD Mangles, P Nilson, K Krushelnick, RJ Clarke, PA Norreys

Abstract:

Intense laser-plasma interactions produce high brightness beams of gamma rays, neutrons and ions and have the potential to deliver accelerating gradients more than 1000 times higher than conventional accelerator technology, and on a tabletop scale. This paper demonstrates one of the exciting applications of this technology, namely for transmutation studies of long-lived radioactive waste. We report the laser-driven photo-transmutation of long-lived 129I with a half-life of 15.7 million years to 128I with a half-life of 25 min. In addition, an integrated cross-section of 97±40 mbarns for the reaction 129I(γ,n)128I is determined from the measured ratio of the (γ,n) induced 128I and 126I activities. The potential for affordable, easy to shield, tabletop laser technology for nuclear transmutation studies is highlighted.
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Inner-shell photoexcitation of Fe XV and Fe XVI

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 344:3 (2003) 696-706

Authors:

R Kisielius, A Hibbert, GJ Ferland, ME Foord, SJ Rose, PAM van Hoof, FP Keenan
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Demonstration of Fusion-Evaporation and Direct-Interaction Nuclear Reactions using High-Intensity Laser-Plasma-Accelerated Ion Beams

Physical Review Letters 91:7 (2003)

Authors:

P McKenna, KWD Ledingham, T McCanny, RP Singhal, I Spencer, MIK Santala, FN Beg, K Krushelnick, M Tatarakis, MS Wei, EL Clark, RJ Clarke, KL Lancaster, PA Norreys, K Spohr, R Chapman, M Zepf

Abstract:

Heavy-ion induced nuclear reactions in materials exposed to energetic ions produced from high-intensity ([Formula presented]) laser-solid interactions have been experimentally investigated for the first time. Many of the radionuclides produced result from the creation of “compound nuclei” with the subsequent evaporation of proton, neutron, and alpha particles. Results are compared with previous measurements with monochromatic ion beams from a conventional accelerator. Measured nuclide yields are used to diagnose the acceleration of ions from laser-ablated plasma to energies greater than 100 MeV. © 2003 The American Physical Society.
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